I have a set for the fz600 and like them. you can get short or long versions. If your having trouble with leverage, Id get the long ones.
buy them from aliexpress, way cheaper but takes longer to get here
http://www.aliexpress.com/af/fz6-brake-lever.html?ltype=wholesale&d=y&origin=n&isViewCP=y&catId=0&initiative_id=SB_20160229131735&SearchText=fz6+brake+lever